HOw to make a guy come back to you. ?

OKay. so , me and this guy were talking for about 6 months & things were like a roller coatser. one minute we really like eachother & the next he was flirting with other girls on myspace. There was nothing i could do about it cause we wernent "dating". But he was promicing to ask me out & telling me he didnt want to be friends with benefits but he wanted to actually date. it went on for 6 months, at one point he was talking to me & another girl teling us the same stuff but things between them ended so me & him wre talking again. he treated me really good all except for the talking to other girls also. he pulled out my chair & everything& i realllyyy liked him. We hung out alot, & hed come to my sports events. but sometimes when me & him wuld watch another game he would be like :whoahh sh has a nice ". but he said he only did it to get a reaction outaa me to make sure i still liked him.I told him that if he was to kiss me i would want him to be sure he was going toask me out, so he kissed me about 5 times all together but still hadnt asked me out. so one day i gave him a time period to ask me to be his gf. it was a week, which gave him plenty of tim. before the week was over he came over & got on myspace at my house. he forgot to log off beofre he left & i read he messages when he eft. they were from other girls. & one girl said they wouldnt work cause she knew that him & his ex had something speacial???? i thought me and him had something speacial....he really seemed to lke me. but i ended thing with him, & hes now moved on. but i haventttt. i want him back, so what to i do to make him want me back? pleaseee help!